description Legrandite Overview
Legrandite is a rare hydrated zinc arsenate mineral with the chemical formula Zn2AsO4(OH)·H2O and a monoclinic crystal system. It commonly forms bright yellow crystals or crusts in the oxidized zones of zinc-bearing ore deposits, and its vivid color and sharply developed crystals make it a mineral of interest to collectors. The species was described in 1932, and the Ojuela Mine near Mapimí, Mexico, is a noted source of specimens.
help Legrandite FAQ
What is the chemical formula of legrandite?
Legrandite is a hydrated zinc arsenate with the formula Zn2AsO4(OH)·H2O. The arsenic content means specimens should be handled as collector minerals rather than as ordinary decorative stones.
What color is legrandite?
Legrandite is best known for vivid yellow crystals or yellow crusts. Its bright color and sharply formed crystals make it popular with mineral collectors.
Where does legrandite form?
It forms in oxidized zones of zinc-bearing ore deposits, where groundwater alters primary sulfide minerals. Famous specimens are associated with mineral localities such as Mapimí in Durango, Mexico.
What crystal system does legrandite have?
Legrandite crystallizes in the monoclinic system. Its crystals are often prismatic or sharply developed, although it can also occur as crusts.
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